You not only can, but you must.If you don't, you will drown. Find outlets for your stress. Make sure you take care of yourself. It honestly doesn't require 12-14 hour days. If you're effective with your time, you could easily get by with 4-5 hours a day in addition to your two classes and still do a ton of work (I'm talking about what's required and then a lot extra). And you only need to work one day over the weekend, max.
I would go crazy if I didn't take time out of my life to do some heavy drinking, sex, and video games every now and then. Take today for instance: I spent the whole weekend finishing up my memo, turned it in just before noon today, and have been drinking ever since. I will continue drinking tonight. Hopefully sex will follow. Class tomorrow, back to work.
Honestly, I think all law schools should take a mid-semester break for a week for the sake of the students. Someone (one of the Cals? W&M? Somebody) already does this, but I don't think most places do. FSU sure doesn't.